[807] | 1 | // |
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| 2 | // ******************************************************************** |
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| 3 | // * License and Disclaimer * |
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| 4 | // * * |
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| 5 | // * The Geant4 software is copyright of the Copyright Holders of * |
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| 6 | // * the Geant4 Collaboration. It is provided under the terms and * |
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| 7 | // * conditions of the Geant4 Software License, included in the file * |
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| 8 | // * LICENSE and available at http://cern.ch/geant4/license . These * |
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| 9 | // * include a list of copyright holders. * |
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| 10 | // * * |
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| 11 | // * Neither the authors of this software system, nor their employing * |
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| 12 | // * institutes,nor the agencies providing financial support for this * |
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| 13 | // * work make any representation or warranty, express or implied, * |
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| 14 | // * regarding this software system or assume any liability for its * |
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| 15 | // * use. Please see the license in the file LICENSE and URL above * |
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| 16 | // * for the full disclaimer and the limitation of liability. * |
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| 17 | // * * |
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| 18 | // * This code implementation is the result of the scientific and * |
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| 19 | // * technical work of the GEANT4 collaboration. * |
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| 20 | // * By using, copying, modifying or distributing the software (or * |
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| 21 | // * any work based on the software) you agree to acknowledge its * |
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| 22 | // * use in resulting scientific publications, and indicate your * |
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| 23 | // * acceptance of all terms of the Geant4 Software license. * |
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| 24 | // ******************************************************************** |
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| 25 | // |
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| 26 | // |
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| 27 | // |
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| 28 | |
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| 29 | #include <time.h> |
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| 30 | |
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| 31 | #include "Randomize.hh" |
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| 32 | #include "G4TransportationManager.hh" |
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| 33 | |
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| 34 | #include "G4ExplicitEuler.hh" |
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| 35 | #include "G4ImplicitEuler.hh" |
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| 36 | #include "G4SimpleRunge.hh" |
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| 37 | #include "G4SimpleHeum.hh" |
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| 38 | #include "G4ClassicalRK4.hh" |
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| 39 | #include "G4CashKarpRKF45.hh" |
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| 40 | |
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| 41 | #include "F04GlobalField.hh" |
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| 42 | |
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| 43 | F04GlobalField* F04GlobalField::object = 0; |
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| 44 | |
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| 45 | F04GlobalField::F04GlobalField() : G4ElectroMagneticField(), |
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| 46 | minStep(0.01*mm), deltaChord(3.0*mm), |
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| 47 | deltaOneStep(0.01*mm), deltaIntersection(0.1*mm), |
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| 48 | epsMin(2.5e-7*mm), epsMax(0.05*mm), |
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| 49 | fEquation(0), fFieldManager(0), |
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| 50 | fFieldPropagator(0), fStepper(0), fChordFinder(0) |
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| 51 | //F04GlobalField::F04GlobalField() : G4MagneticField(), |
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| 52 | // minStep(0.01*mm), deltaChord(3.0*mm), |
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| 53 | // deltaOneStep(0.01*mm), deltaIntersection(0.1*mm), |
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| 54 | // epsMin(2.5e-7*mm), epsMax(0.05*mm), |
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| 55 | // fEquation(0), fFieldManager(0), |
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| 56 | // fFieldPropagator(0), fStepper(0), fChordFinder(0) |
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| 57 | { |
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| 58 | fFieldMessenger = new F04FieldMessenger(this); |
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| 59 | |
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| 60 | fields = new FieldList(); |
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| 61 | |
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| 62 | fStepperType = 4 ; // ClassicalRK4 is default stepper |
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| 63 | |
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| 64 | // set object |
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| 65 | |
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| 66 | object = this; |
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| 67 | |
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| 68 | updateField(); |
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| 69 | } |
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| 70 | |
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| 71 | F04GlobalField::~F04GlobalField() |
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| 72 | { |
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| 73 | clear(); |
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| 74 | |
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| 75 | delete fFieldMessenger; |
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| 76 | |
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| 77 | if (fEquation) delete fEquation; |
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| 78 | if (fFieldManager) delete fFieldManager; |
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| 79 | if (fFieldPropagator) delete fFieldPropagator; |
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| 80 | if (fStepper) delete fStepper; |
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| 81 | if (fChordFinder) delete fChordFinder; |
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| 82 | } |
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| 83 | |
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| 84 | void F04GlobalField::updateField() |
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| 85 | { |
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| 86 | first = true; |
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| 87 | |
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| 88 | nfp = 0; |
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| 89 | fp = 0; |
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| 90 | |
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| 91 | clear(); |
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| 92 | |
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| 93 | // Construct equ. of motion of particles through B fields |
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| 94 | // fEquation = new G4Mag_EqRhs(this); |
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| 95 | // Construct equ. of motion of particles through e.m. fields |
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| 96 | // fEquation = new G4EqMagElectricField(this); |
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| 97 | // Construct equ. of motion of particles including spin through B fields |
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| 98 | // fEquation = new G4Mag_SpinEqRhs(this); |
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| 99 | // Construct equ. of motion of particles including spin through e.m. fields |
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| 100 | fEquation = new G4EqEMFieldWithSpin(this); |
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| 101 | |
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| 102 | // Get transportation, field, and propagator managers |
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| 103 | G4TransportationManager* fTransportManager = |
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| 104 | G4TransportationManager::GetTransportationManager(); |
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| 105 | |
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| 106 | fFieldManager = GetGlobalFieldManager(); |
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| 107 | |
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| 108 | fFieldPropagator = fTransportManager->GetPropagatorInField(); |
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| 109 | |
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| 110 | // Need to SetFieldChangesEnergy to account for a time varying electric |
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| 111 | // field (r.f. fields) |
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| 112 | fFieldManager->SetFieldChangesEnergy(true); |
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| 113 | |
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| 114 | // Set the field |
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| 115 | fFieldManager->SetDetectorField(this); |
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| 116 | |
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| 117 | // Choose a stepper for integration of the equation of motion |
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| 118 | SetStepper(); |
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| 119 | |
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| 120 | // Create a cord finder providing the (global field, min step length, |
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| 121 | // a pointer to the stepper) |
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| 122 | fChordFinder = new G4ChordFinder((G4MagneticField*)this,minStep,fStepper); |
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| 123 | |
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| 124 | // Set accuracy parameters |
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| 125 | fChordFinder->SetDeltaChord( deltaChord ); |
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| 126 | |
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| 127 | fFieldManager->SetAccuraciesWithDeltaOneStep(deltaOneStep); |
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| 128 | |
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| 129 | fFieldManager->SetDeltaIntersection(deltaIntersection); |
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| 130 | |
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| 131 | fFieldPropagator->SetMinimumEpsilonStep(epsMin); |
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| 132 | fFieldPropagator->SetMaximumEpsilonStep(epsMax); |
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| 133 | |
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| 134 | G4cout << "Accuracy Parameters:" << |
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| 135 | " MinStep=" << minStep << |
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| 136 | " DeltaChord=" << deltaChord << |
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| 137 | " DeltaOneStep=" << deltaOneStep << G4endl; |
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| 138 | G4cout << " " << |
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| 139 | " DeltaIntersection=" << deltaIntersection << |
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| 140 | " EpsMin=" << epsMin << |
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| 141 | " EpsMax=" << epsMax << G4endl; |
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| 142 | |
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| 143 | fFieldManager->SetChordFinder(fChordFinder); |
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| 144 | |
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| 145 | } |
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| 146 | |
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| 147 | F04GlobalField* F04GlobalField::getObject() |
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| 148 | { |
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| 149 | if (!object) new F04GlobalField(); |
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| 150 | return object; |
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| 151 | } |
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| 152 | |
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| 153 | void F04GlobalField::SetStepper() |
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| 154 | { |
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| 155 | if(fStepper) delete fStepper; |
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| 156 | |
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| 157 | switch ( fStepperType ) |
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| 158 | { |
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| 159 | case 0: |
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| 160 | // fStepper = new G4ExplicitEuler( fEquation, 8 ); // no spin tracking |
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| 161 | fStepper = new G4ExplicitEuler( fEquation, 12 ); // with spin tracking |
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| 162 | G4cout << "G4ExplicitEuler is called" << G4endl; |
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| 163 | break; |
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| 164 | case 1: |
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| 165 | // fStepper = new G4ImplicitEuler( fEquation, 8 ); // no spin tracking |
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| 166 | fStepper = new G4ImplicitEuler( fEquation, 12 ); // with spin tracking |
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| 167 | G4cout << "G4ImplicitEuler is called" << G4endl; |
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| 168 | break; |
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| 169 | case 2: |
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| 170 | // fStepper = new G4SimpleRunge( fEquation, 8 ); // no spin tracking |
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| 171 | fStepper = new G4SimpleRunge( fEquation, 12 ); // with spin tracking |
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| 172 | G4cout << "G4SimpleRunge is called" << G4endl; |
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| 173 | break; |
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| 174 | case 3: |
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| 175 | // fStepper = new G4SimpleHeum( fEquation, 8 ); // no spin tracking |
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| 176 | fStepper = new G4SimpleHeum( fEquation, 12 ); // with spin tracking |
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| 177 | G4cout << "G4SimpleHeum is called" << G4endl; |
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| 178 | break; |
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| 179 | case 4: |
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| 180 | // fStepper = new G4ClassicalRK4( fEquation, 8 ); // no spin tracking |
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| 181 | fStepper = new G4ClassicalRK4( fEquation, 12 ); // with spin tracking |
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| 182 | G4cout << "G4ClassicalRK4 (default) is called" << G4endl; |
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| 183 | break; |
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| 184 | case 5: |
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| 185 | // fStepper = new G4CashKarpRKF45( fEquation, 8 ); // no spin tracking |
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| 186 | fStepper = new G4CashKarpRKF45( fEquation, 12 ); // with spin tracking |
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| 187 | G4cout << "G4CashKarpRKF45 is called" << G4endl; |
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| 188 | break; |
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| 189 | default: fStepper = 0; |
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| 190 | } |
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| 191 | } |
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| 192 | |
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| 193 | G4FieldManager* F04GlobalField::GetGlobalFieldManager() |
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| 194 | { |
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| 195 | return G4TransportationManager::GetTransportationManager() |
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| 196 | ->GetFieldManager(); |
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| 197 | } |
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| 198 | |
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| 199 | void F04GlobalField::GetFieldValue(const G4double* point, G4double* field) const |
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| 200 | { |
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| 201 | // NOTE: this routine dominates the CPU time for tracking. |
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| 202 | // Using the simple array fp[] instead of fields[] |
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| 203 | // directly sped it up |
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| 204 | |
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| 205 | field[0] = field[1] = field[2] = field[3] = field[4] = field[5] = 0.0; |
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| 206 | |
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| 207 | // protect against Geant4 bug that calls us with point[] NaN. |
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| 208 | if(point[0] != point[0]) return; |
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| 209 | |
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| 210 | // (can't use nfp or fp, as they may change) |
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| 211 | if (first) ((F04GlobalField*)this)->setupArray(); // (cast away const) |
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| 212 | |
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| 213 | for (int i=0; i<nfp; ++i) { |
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| 214 | const F04ElementField* p = fp[i]; |
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| 215 | if (p->isInBoundingBox(point)) { |
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| 216 | p->addFieldValue(point,field); |
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| 217 | } |
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| 218 | } |
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| 219 | |
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| 220 | } |
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| 221 | |
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| 222 | void F04GlobalField::clear() |
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| 223 | { |
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| 224 | if (fields) { |
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| 225 | if (fields->size()>0) { |
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| 226 | FieldList::iterator i; |
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| 227 | for (i=fields->begin(); i!=fields->end(); ++i) delete *i; |
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| 228 | fields->clear(); |
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| 229 | } |
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| 230 | } |
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| 231 | |
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| 232 | if (fp) delete[] fp; |
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| 233 | |
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| 234 | first = true; |
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| 235 | |
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| 236 | nfp = 0; |
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| 237 | fp = NULL; |
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| 238 | } |
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| 239 | |
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| 240 | void F04GlobalField::setupArray() |
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| 241 | { |
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| 242 | first = false; |
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| 243 | nfp = fields->size(); |
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| 244 | fp = new const F04ElementField* [nfp+1]; // add 1 so it's never 0 |
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| 245 | for (int i=0; i<nfp; ++i) fp[i] = (*fields)[i]; |
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| 246 | } |
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